a,-2x^3y(2x^2-3y+5yz)b,(x-2y)(x^2y^2-xy+2y)c,2/5xy(x^2y-5x+10y)d,2/3x^2y.(3xy-x^2+y)e,(x-y)(x^2+xy+y^2)f,(1/2xy-1).(x^3-2x-6)
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